Worlds of IF - Science Fiction: November 1966 Volume 16, No. 11
Illustrations by Dan Adkins, Jack Gaughan, Gray Morrow, Virgil Finlay. Cover by Dan Adkins (for "A Code for Sam")

Novelettes: "Truce or Consequences" by Keith Laumer (a "Retief" tale)
"At the Core" by Larry Niven ("Known Space" series)
"The Sign of Gree" by C. C. MacApp ("Gree" series)
"A Code for Sam" by Lester del Rey

Serials: "Snow White and the Giants" (Part 2 of 4) by J. T. McIntosh.

Stories: "The Babe in the Oven" by John T. Sladek
"Halfway House" by Robert Silverberg
"Hairry" by Mike Hill
"The Boat in the Bottle" by Thurlow Weed

Edited by Frederik Pohl; Judy-Lynn Benjamin is Associate editor. Fandom column by Lin Carter. With Pohl at the helm (who also edited the sister magazines Galaxy and Worlds of Tomorrow), the lineup of authors is starting to look like a "Who's Who" of SF. Niven's "Neutron Star" from the October, 1966 issue is the 1967 Short Story winner (and the first of 6 "Known Space" stories in a span of 7 issues.) This is the second of 3 consecutive years that IF wins the Hugo award for "best magazine" (in 1966, 1967 and 1968 - each for the previous year.)